Retrofit accessing multiple models in Json response

Question

I have some JSON below. Before I only had the items element in the JSON response and was using retrofit to access this with the following code. Which worked fine.

But now I have added the recommendation section, I have created the recommendation model but how do I now access the data from the recommendation/items section of the response?

edit Maybe there is a better way to have this data returned. There could be maybe 500 items but only 20/30 lists so I thought it was better to split up instead of duplicating the data.

JSON

[
{
    "recommendation": [
        {
            "following": true,
            "list_id": "29",
            "list_name": "list29",
        },
        {
            "following": false,
            "list_id": "28",
            "list_name": "list28",
        }
    ]
},
{
    "items": [
        {
            "description": [
                "line1",
                "line2",
                "line3"
            ],
            "image1": "4367218/img1.jpg",
            "item_id": 5600,
            "title": "Title 1",
            "recommendation_id": 29
        },
        {
            "description": [
                "line1",
                "line2",
                "line3"
            ],
            "image1": "342345/img1.jpg",
            "item_id": 3600,
            "title": "Tite2",
            "recommendation_id": 28
        }
    ]
}
]

Recommendation Model

public class Recommendation {

    private Boolean following;
    private int listId;
    private String listName;

    public Boolean getFollowing() {
        return following;
    }

    // more getters and setters
}

Item Model

public class Item {

    private int item_id;
    private String title;
    private ArrayList<String> description;
    private String image1;
    private int recommendation_id;

    // more getters and setters
}

Retrofit GET

// feed
@GET("/items/{user_id}/{num_items}")
public void getFeedData(@Path("user_id") int user_id, @Path("num_items") Integer num_items, Callback<List<Item>> response);

Answer 1

{
    "recommendation": [
        "data":{
            "following": true,
            "list_id": "29",
            "list_name": "list29"
        },
       "data": {
            "following": false,
            "list_id": "28",
            "list_name": "list28"
        }
    ]
},
{
    "items": [
        "data_item":{
            "description": [
                "line1",
                "line2",
                "line3"
            ],
            "image1": "4367218/img1.jpg",
            "item_id": 5600,
            "title": "Title 1",
            "recommendation_id": 29
        },
         "data_item":{
            "description": [
                "line1",
                "line2",
                "line3"
            ],
            "image1": "342345/img1.jpg",
            "item_id": 3600,
            "title": "Tite2",
            "recommendation_id": 28
        }
    ]
}

Model:

public class Model{

ArrayList<Data> recommendation ; 
ArrayList<DataItem> items ;
}

Data Model :

public class Data{

   private boolean following ;
   private String list_id ;
   private String list_name ;

}

DataItem Model :

public class DataItem{

private String description [];
private String image1 ;
private String item_id ;
private String title ;
private String recommendation_id ;

}

Answer 2

I would recommend converting your JSON root from array to object:

{
    "recommendation": [...],
    "items": [...]
}

Then have Retrofit parsed JSON response into a new model, let's say Response :

public class Response {
    private Recommendation[] recommendation;
    private Item[] items;
    // your getters
}